package com.gm.common;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1. 根据session取出当前登陆的用户
        Object user = request.getSession().getAttribute("userInfo");
        // 2. 根据用户来判断
        if (user == null) {
            // 未登录,返回登陆页面
            request.setAttribute("msg","没有权限，请先登陆！");
            request.getRequestDispatcher("/login.html").forward(request,response);
            return false;
        }else{
            // 已登录 放行
            return true;
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
